D'aaaaaaaaw, that's just horrible:
"HEY, YOU'RE A KITTY!"
"OH NOES, I HAVE TO GO TO WORK. BRB"
"KITTY ISN'T HERE ANYMORE, SOMEONE ELSE TOOK HIM IN."
BAAAAW...
Well, try to make yourself feel better.
Think of how the people that took him in are looking after him and caring for him.
Unless that makes it more painful, then I don't know what you can do.
My computer's breaking down, so nope.
"Most people think they're thinking, when in fact, they're just rearranging their prejudices."- William James